The salt mills crushed the salt clumps extracted from the salt pans of the Mar Menor. On their blades, which could measure between 10 and 14 meters, Latin sails were tied, identical to the sails used by the fiserment of the Mar Menor on their boats.

In the salt pans, other types of mills could also be found, whose function was to extract seawater and transport it to the resevoirs of the salt pans. These mills were built very close to the sea to facilitate the transer of water and allow it to evaporate to obtain salt.

As examples of these two uses, we find the mills in Pudrimel, one for lifting water and the other for grinding salt. Of these two mills, only the tower is preserved. Both types of salt mill now bear witness to the economic importance that the salt industry and trade had in the region.